Push button or remote start with automatic reset. For exact, fully automatic timing of all darkroom work. Interval and remaining time indicators. Safelight goes out when push button is operated. The P-72 features a luminous dial and a heavy-duty synchronous motor with a 100w load capacity. Linecord, enlarger and safelight outlets are polarized with a two wire and ground connection. The small receptacle accepts the optional FS-59 Footswitch for remote operation. U.L. listed.